Join the sweeping spectacle of hundreds of migrating zebras in the vast plains of East Africa. Witness the mysterious migration of more than 120 million red crabs on tiny Christmas Island in the Indian Ocean. Encounter the affectionate curiosity of majestic gray whales in the beautiful lagoons of Mexico's Baja California. Enter a golden blizzard as tens of millions of monarch butterflies fill the sky in the hidden highlands of Mexico. Take flight alongside migratory birds navigating by sun, stars, and instinct. Travel back in time among exotic tribes of Africa to explore the roots of human migration.